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activity adrenin alive amoeba amongst animals become behaviour blood bodily body brain brain-cells causes changes CHAPTER chemical chemical substances chromosomes civilisation colour complete connected consciousness consists currents descended digestive ear-nerve eardrum ears earth effect electric electric filament emotions evolution existence eyes fact feeling fibres flesh fluid bearing fossils Garden of Eden genes glands gradually grey matter grow hear heart human idea imagine individual inside instance intelligence intestines kindled latter light living cells living things man's material means mechanical ment mental microbes millions mind movements muscle-cells muscles nature nerve nerve-cells nerve-currents nerve-fibres objects one's ordinary origin oxygen past patterns person Pharaohs physical plants present primitive produced race religion result retina round rousing points sense-cells senses sensitive Shirley poppies single skin soft cells soul sounds spirit substances surroundings survival thought tiny tion to-day traits universe whole words